SIMILARITY OF VELOCITY PROFILES IN NON-UNIFORM LONGSHORE CURRENTS

Hossam El-din A.A. Refaat, Yoshito Tsuchiya, Yoshiaki Kawata

Abstract

In studying beach changes a law for non-uniform longshore sediment transport is generally needed, which concerns the non-uniform longshore currents. Therefore, experimental study on the similarity of velocity profiles in non-uniform longshore currents was carried out on a plane beach. It was concluded that, the velocity profiles are in similitude alongshore by comparing the nominal velocity at the breaker point. The boundary layer approximation can therefore be applied to the nearshore current equations to derive a single integral equation of non-uniform longshore currents. The theoretical solution of the equation is shown to compare with experimental results. The comparison between the theoretical and experimental non-uniform longshore current velocities are in satisfaction.